Factubing co



2 1 Apnl 6, 927 F. J. RODE DIE CUSHION Filed May 29, 1925 a piston reciprocable therein.

Patented Apr. 2.6, 1927. p u

UNITED STATES Y `'1,626,051 ENT OFFICE.

PAT

FRIEDRICH J. RODE, 0F CHICAGO, ILLINOIS, ASSIGNOR T0 MABQUETTE TOOL MANU- FACTURING CO., OF CHICAGO, ILLINOIS, .A CORPORATION OF ILLINOIS.

DIE CUSHION.

Application llled Iay 29, 1925. Serial No. 33,612.

Cushioning devices for sheet metal drawing presses generally comprise a cylinder supplied with fluid and in which cylinder resistance pressure is increased by means of The piston rod which extends beyond the cylinder is usually connected at one extremity to a pressure plate, commonly known as a pin plate for the reason that pins which support one 1U of the die members pass loosely through the bed plate of the machine and rest upon the plate. As pressure is exerted upon the dle through the medium of the ram or some other reciprocable element in the machine the plate and the pistons are correspondingly lowered through the medium of the pins and against the pressure in the cylinders.

In some instances when the pin plate is of a considerable area-a number of cylinders are used and the piston rods are each connected with the pressure or pin plate.

It has been found that .under such conditions the pressure or piu plate is not always maintained in a horizontal position during its lowering movement due, among other things, to the fact that a reater pressure will be exerted at some polnts throughout the area of the plate than at others, resulting on account of the rigid connection, in a 3 binding of the Aparts with the ultimate resulting injury.

It is one of the objects of the present in vention to overcome these difficulties and objections and to provide an improved ilexible connection between the end of the piston rod and the pressure or pin plate which will yield when the plate is tilted or moves out of the horizontal position and at thev same time will not interfere with the plate bein subjected to the full resistance pressure o the fluid in the cylinder.

To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompanying drawing illustrating this invention, and in which- Figure 1 is a view partly vin elevation, partly in section and Awith parts broken away of a portion of a sheet metal drawing press having cushioning devices applied thereto and connected with the pin or pressure plate by means of a connection constructed .in accordance with the principles of this 1nvention.

and 11 and 12 are the reciprocating members f which are adaptedto be reciprocated in any suitable manner well known in this art.

Supported beneath the bed plate 10 in any suitable manner are a plurality of cushioning devices each of which embodies a cylinder 13 'to which fluid is supplied from any suitable source through piping 14.

Reciprocable in the cylinders are pistons (not shown) andA connected with each of the pistons is a piston rod 15, which projects beyond the end of the cylinder.

Disposed beneath the bed plate 10 is a pressure or pin plate 16 whichis supported by means of the piston rods 15 and these piston rods are lconnected with the pressure or pin plate 16. Formed on the end of each of the piston rods 15 is a ball shaped member of any desired and suitable configuration and this member may be formed integral with the end of the piston rod `or may be formed separately therefrom asI shown. When formed separately therefrom, the member 17 is connected with thegextremity of the piston rod 15 in any suitable manner preferably through the medium of a screw 18 which screws into each of the parts and when in position, the. parts may be held against rotative displacement by means of a suitable locking screw 19. I

The extremity 17 of the piston rod projects into a casing 20, which latter is secured in any desired or suitable manner to the lower face of the pressure or pin plate 16, preferably through the medium of fastening Vbolts 21 which pass through suitable apertures 22 in a flange 23 on the casing 20.

A removable cover plate 24 is secured to the casing 20 in any suitable manner such as `shaped member 17 so as to permit the piston the plate 16 may be rocked or tilted with rod and the casing 20 to be' rocked relatively one with respect to the other.

When the extremity 17 is disposed within the casing 20 the upper spherical face 28 thereof has contact with the lower face of the plate 24'and an annular member 29 having a seat 30 contacts with the opposite face of the extremity 17. This member 29 is of an external Ydiamet-er somewhat less than the internal diameter of the casing 2O so as to permit the member 29 to be bodily moved when the casing 20 and piston rod 15 are rocked with respect to each other.

The member 29 is supported by means of an annular member 31 which is also provided with an opening 32 of a diameter cousiderably greater than the external diameter of the vpiston rod 15. The external diameter of the member 31 is such that it will snugly fit within the casing 20 and will be held against bodily movement in a direction edgewise of the member:

lThe member 30 is supported by means of resilient elements 33 ,preferably in the form of coil springs, any number of which may be provided, -four Lbeing here shown, and oneY extremity thereof engages and rests against the lower face `of ,the member 31, while the other extremities thereof rest upon the bottom of the casing 20. A pin or projection 34 may be provided which is secured to the bottom of the casing 10 and projects thereinto and within the resilient elements 33 so as to hold the latter in position.

The stress of these resilient elements 33 is such that under normal conditions the member 31 will cause the bearing 30 in thev member 29 to contact withthe face `of the extremity 17 and this will hold'the upper surface of the extremity 17 in contact with the lower face of the plate 24and prevents the piston `and piston Vrods from dropping with respect to the pin or pressure plate 16 when the weight of the piston and piston rod overcomes the pressure in the cylinders 13.

With this improved construction it will be' manifest that the surface 28 of the extremities 17 of the piston rods 15 will be main-- tained in contact with the lower face of the respective vplates 24 so that when pressure is exerted uponthe die 35 which is supported by the pins 36, and which latter rest upon the pin or pressure plate 16, the piston rods 15 will be lowered against the stress of the iuid pressure in the cylinders 13.

Should greater pressure be exerted upon the plate 16 at one point than at another point, the tendency would be to tilt the plate 16 or cause it to be moved out of a horizontal y position and will tilt the same with respect 'to the piston rods 15. By reason .of the flexible connection between the piston rod 15 and the plate 16 it will be manifest that respect to the piston rods 15 Without causingy any 1n]ury to the parts and without causing the plate 16 to be relieved of the resistance ot' any of the Huid lpressure in the cylinder 13. d DuringI this tilting movement the plate 16 willturn upon the bearings formed by the vfaces 28 of the piston rods and the lower faces of the respecbtive plates 24.

When this connection is applied to the plate 16 the plate 26 will rest flat against the lower face of the plate 16.

When Athe pin or pressure plate 16 is' beingr elevated the piston rods 15 and piston connected thereto will beheld against dropping away from the plate 16 upon the reduction of the pressurein the cylinder 13, through the medium of the resilient members or springs 33 which hold the bearing plate A29 against the extremity 17 of the piston rod and also holds the surface 28 of the cxtremity 17 against the plate 24.

'It will be manif-est that this improved construction may be applied to any machine now on the market which have similar cushions connected thereto, without altering the construction of the other machine and may as readily be detached therefrom.

While lthe preferred form of the invention has been herein shown and described it is to be understood that various changes may be made in the details ofl construction and in the combination and arrangement of the` several parts, within the scope of the claims,

-withouty departing` from the spirit of this invention.

What is claimed as new is 1. In a sheet metal drawing press a pressure member, a cushioning device therebelow, means connecting the cushioning device with the pressure member, said connecting means embodying a member having a curved extremity on one end thereof, and resiliently yielding means other than the cushioning device for maintaining the said curved extremity in abutment Awith the said pressure member, said connecting meansl permitting the pressure member to tilt with respect to the -said cushioning means.

2. In a sheet metal drawing lpress a pressure plate,l a Huid pressure cushioning device therebetween and embodying a cylinder and piston reciproclable therein, a piston rod, and means connecting the end of the piston rod directly with the said plate, the said conl a relative rocking movement between the plate and piston rod, and means other than the fluid pressure for maintaining the end of the piston rod in abutment with the plate.

4..In combination a pressure cushion, including a rod like element, a pressure member separate therefrom, a coupling between said element and member, said coupling embodying a ball like device onv the end of said rod, a casin connected with the said member and iii whic casing the ball is disposed, and a yielding seat having engagement with the said ball on the side thereofl adjacent its point of connection with the said rod.

Y 5. In a sheet metall drawing press a pressure plate, a cushioning device therebelow,

means connecting the cushioning device with between the second annular member and the bottom of the casing.

6. In a sheet metal'drawing press a pressure plate, a cushioning device thereb'elow, means connecting the cushioning device with the plate, said means embodying a closed casin having an oeniiig through the bottom t ereof, a rod li e device projectin into the casing through said opening, a kno like formation on the end of the rod and within the casing, the external diameter of the rod being considerably less than the diameter of said openin a, bearing within the casing and contacting with the lower face of said" formation, and resilient means also within the casing dis osed between said bearing and the bottom o the casing and operating independently of the cushioning device to hold the bearing against said formation and the latter against the'opposite wall of the casing.

7. In a sheet metal drawin press a pressure plate, a cushioning device therebelow, means connecting the cushioning device with the plate, said means embodying a closed casing having an lo ening through 'one wall thereof, a rod like evice projecting into the casing through said 'openin the diameter of said rod being considerab y less than the diameter of said opening, theextremity of the rod being convexed and abutting one of the walls of the casing, and means within the casing and operating independently of `the cushioning device for holding said extremity of the rod against the casing wall,

the said means permitting a rocking move-v ment of the rod and casing,one with respect to the other.

8. In combination a closed casing having an opening through one wall thereof, arod like device projecting into the casing through saidopening and being yof adiameter considerably less than the diameter `of said opening, an' enlarged forma? ion on the end of the rod and having a convexed surface, an annular bearing inember-encompassing' the rod and contacting with a portion of the face of said formation, a second annular member ywithin the casing and contacting the first said member, and resilient elements also within the casing and disposed between the said second annular member and the base of the casing and operating to hold another portion ofthe face of the said enlarged formation in rocking engagement with the casing wall.

9. In combination a closed casing havin" an opening through one wall thereof, a ro like i device projecting into the casing through said opening and being of a diameter considerably less than the diameter of said opening, an enlarged formation onl the end of the rod and having a convexed surface, an annular bearing member encompassing -the rod and contacting with a portion of the face of'said formation, a second annular member Within the casing and contacting the first said. member, and resilient elements also within the casing and disposed between the said second annular meinber and the base of the casing and operating to hold another portion of the face of the said enlarged formation in rocking engagement with the casing wall, the first recited annular member being of a diameter somewhat less than the internal diameter of the casing and the second recited annular meinber being maintained against bodily edgewise movement in the casing.

10. In combination a closed casing having an opening through one Wall thereof, a rod like device projecting into the casing through said opening and being of a diameter considerably less than the diameter of said opening, an enlarged formation on the end of the rod and having a convexed surface, an annular bearing member encompassing the rod and contacting with a portion ofthe face of said formation, a second annular member within the casing and con-A tacting the first said member, resilient elements alsorwithin the casing and disposed hold another portion of the faceof the said enlarged formation in rocking engagement with the casing wall, the said formation being separate from said rod, and means detachably securing the said formation to the rod.

11. In combination a closed casing having iso an opening through one Wall thereof, a rod like device projecting into the ca sing through said opening and being of a dlameter considerably less than the diameter of said opening, an enlarged formation on the end of the rod and having a convexed surface, an annular bearing member encompassing the rod and contacting with a portion of the face of said-formation, a second annular member Within Jthe casing and contacting the first said member, resilient elements also within the casing and disposed between the said second annular member and the base of the casing and operating to hold another portion of the face of the said enlarged formation in rocking engagement with the casing wall, the said formation being separate from said rod, and a screw device housed within thel rod and said forma-- tion for securing them together.

12. In combination a closed casing having an opening through one Wall thereof, a rod like device projecting into the casing through said opening and being of a diamleter considerably less than the diameter of vsaid opening, an enlarged formation on the endof the rod and having a convexed sur- Vface, an annular bearing member encompassing the rod and contacting with with a portion of the face of said formation, a second annular member Within the casing and contacting the first said member, resilient elements also Within the casing and disposed between the said second annular member and the base of the casing and operating to hold another portion of the face of the said enlarged formation in rocking engagement with the casing wall, the said formation being'separate from the said rod, a screw device housed within the rod and said formation for securing them together, and a fastening device for maintaining the rod and said formation against relative movement. K

In testimony whereof I have signed my name to this Specification, on this 26th day of May, A. D. 1925.

FREDRICH J. RODE. 

